If you can’t file your Colorado tax return by April 18, 2011, you may file your Colorado return on or before October 15, 2011 without filing a written request for extension.
However, to avoid late payment penalties, you must pay at least 90% of your tax liability by April 18 and the balance when you file by October 15.
If you can’t file by April 18 but still owe additional tax, use the payment voucher below to mail in your payment by April 18.
Complete the tax payment worksheet to see if you owe additional taxes. Do not send in the voucher without a payment.
Enter the tax due on form DR 0158-I and mail the voucher portion only with your payment to:
Colorado Department of Revenue
Denver CO 80261-0008
If you have no tax due, do not send the payment voucher.
You will automatically qualify for an extension.